L.O.
I happened to have my son with M. (he was only 6 months old) when I had my last yearly eye exam. My eye doctor told M. that I should bring my son in for his first eye exam at 9 months since they can see more at 9 months than at 12 months (which is when I thought I was supposed to first bring him in)
The exam is quick and he uses some lights and toys to see how he was following them with his eyes. He also dilated his eyes (different drops than what adults get) then check the his eyes again with some lights. My son sat on my lap the whole time.